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well anyone using the l.e.d lpg gauge will know how useless they are.
Years ago when i had a petrol gq i wired mine up to the one in the cluster.
It worked great and didn't jump all over the place just the same as it did on petrol.
All you need is an lpg sender to suit your tank with these ranges.
4.3-5.7 ohms full
74.3-84.8 ohms empty or something close like this http://www.ebay.com.au/itm/Axiom-LPG...item4abb63a405
Then just switch the signal input to the gauge when switching between gas and fuel .